CN106414626A - Ink composition - Google Patents

Ink composition Download PDF

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Publication number
CN106414626A
CN106414626A CN201480079616.0A CN201480079616A CN106414626A CN 106414626 A CN106414626 A CN 106414626A CN 201480079616 A CN201480079616 A CN 201480079616A CN 106414626 A CN106414626 A CN 106414626A
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China
Prior art keywords
acid
ink
composition
lithium
acetylenediol
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Granted
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CN201480079616.0A
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Chinese (zh)
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CN106414626B (en
Inventor
S·瓦素德万
R·J·麦克马努斯
V·雅库贝克
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Hewlett Packard Development Co LP
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Hewlett Packard Development Co LP
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/38—Inkjet printing inks characterised by non-macromolecular additives other than solvents, pigments or dyes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/10—Printing inks based on artificial resins
    • C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/10—Printing inks based on artificial resins
    • C09D11/106—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C09D11/107—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds from unsaturated acids or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/32—Inkjet printing inks characterised by colouring agents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/32—Inkjet printing inks characterised by colouring agents
    • C09D11/324—Inkjet printing inks characterised by colouring agents containing carbon black
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/36—Inkjet printing inks based on non-aqueous solvents

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)

Abstract

An ink composition includes a colorant, a co-solvent, a surfactant system, and water. The surfactant system consists of an acid, lithium, and a non-ionic surfactant. The acid is selected from the group consisting of oleic acid, linoleic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, and combinations thereof. The non-ionic surfactant includes a hydrophilic head group to interact with the lithium and a hydrophobic tail to not sterically hinder formation of an anti-evaporative layer to be formed by the surfactant system. The non-ionic surfactant also excludes any ethyleneoxy groups.

Description

Composition for ink
Background of invention
Ink jet printing or record system are typically used as in printed medium, such as paper, the effective means of upper generation image.Logical Often, ink droplet is ejected on printed medium by nozzle by this ink-jet printing system to produce image thereon.Ink jet printing system The example of system includes thermal ink jet printers and piezoelectric inkjet printer.
Summary of drawings
With reference to the feature and advantage that can be seen that the example of the disclosure as detailed below with accompanying drawing, wherein similar reference pair Should be in assembly that is similar, being perhaps not necessarily the same.
Fig. 1 is amplification, section, cross section, the semi-schematic figure of perspective of process cartridge example；With
Fig. 2 is the flow chart of the method example showing embodiment of the disclosure.
Detailed Description Of The Invention
The example of composition for ink disclosed herein shows desirable print reliability and goes knot lid (decap) performance (thus keeping good nozzle health).
Term referred to herein " going to tie lid performance " refer to ink-jet ink when being exposed to air for a long time easily from The ability of injection in printhead.Go tie lid measure of time be printer nozzle because of block, blocking or coloring agent from nozzle/ The droplet formation region of bay retract and no longer before normal transmission printhead can keep knot lid and untapped time quantum. Before ejecting thermal jet writing brush can keep not using and go tying lid with formed required for the ink droplets of acceptable quality when Between length referred to as go tie the lid time, or the first drop go tie the lid time.Another go tie lid module (referred to as " and persistently go tie Lid " or " being injected on the page " (SoP) go to tie lid) it is the injection quantity being kept with concrete time interval needed for pen health.As SoP goes to tie the example of lid, can be in the relatively long time based on big form ink-jet printer including large-scale fixed type bar Interior (such as about 10 minutes to about 8 hours) are removed knot lid and are not used it is possible to spray each nozzle at random by often several seconds To attempt keeping nozzle health.To any given ink, the longest of acceptable first drop mass is provided to go to tie the lid time Or any given go to tie the lid time when required minimum injection quantity will be desirable.
Evaporate from ink formulations generally, due to water, in ink, the percentage ratio of organic component improves.Because ink is organic Become more to be enriched with cosolvent and other nonvolatile element, wherein coloring agent (for example scattered pigment) quilt of strongly hydrophilic Retract/be retracted in aqueous phase body.
The example of the disclosure contributes to the degree/speed controlling pigment to shrink in the way of effective and cost-effective.Pigment Contraction is referred to herein as " paint ink carrier separates " (PIVS).
Because paint ink is dried it may occur however that quick PIVS (for example within the about 1-4 second) in ink jet-print head, this Nozzle and/or ink channel can be led to be substantially free of coloring agent.Equally, the fast velocity of PIVS is typically unacceptable, because Vacant (or removing knot lid) time is too short.In order to solve PIVS, ink-jet printer can force printhead fixed one vacant time Be ejected into after phase special absorption pad/ink collector (spittoon) upper (for example, under given frequency every nozzle predetermined jet number Amount can keep the nozzle health of idle nozzle in print procedure).Injection rate is substantially controlled by PIVS speed.Very frequency Numerous injection is typically unacceptable, because consuming ink in course of injection, and slows down printing.
On the contrary, the slow rate (for example, approximately greater than 4 seconds to about 60 seconds) of PIVS is generally benign to printhead operation, example As when printhead is stored in knot lid position, because which prevent the unacceptable blocking of nozzle or coloring agent from nozzle Retract.Additionally, in some cases it is also desirable to print system shows very slow PIVS (for example, more than 1 minute to several Hour).
Additionally, the example of the composition for ink of the disclosure also to dye based inks water provide improved go tie lid performance.? In the case of based on pigment with based on the in itself previously known ink of dyestuff, when the water evaporates, in some cases may be in nozzle Place forms viscosity plug.Subsequent ink droplets will have to pass through the transmitting of this viscosity plug, and therefore, initial minority drop is possibly cannot Spray/suitably it is ejected into outside hole.Depending on this ink, it may happen that successful spray after some transmitting events.On the contrary, originally The example of disclosed composition for ink seems to prevent from forming this viscosity plug (in pigment base or dye based inks water), and controlled PIVS (in pigmented inks).
It is not intended to be bound by any theory the surfactant system it is believed that in the example of the composition for ink of the disclosure Example in the aperture of nozzle the interface between air and composition for ink formed during going knot lid not use anti- Evaporation layer, thereby reduces evaporation from composition for ink for the water.This vaporization prevention layer can remove knot lid untapped about 2 seconds Or formed in shorter time.This vaporization prevention layer contribute to improving ink disclosed herein go tie the lid time.
Although add surfactant in ink for the surface tension changing this ink and wetting characteristicss being generally Desirable, present inventors have found that, some surfactants deleteriously affect the formation of vaporization prevention layer, and thus harmful Ground impact goes to tie lid performance.Therefore, in embodiment disclosed herein, identified and not only facilitated formation vaporization prevention layer Coupling or the table beyond acceptable surfactant properties also in terms of wetting characteristicss needed for reducing surface tension and providing Surfactant system.This surfactant system is by lithium, specifically the group of acid and specific nonionic surfactant is combined into. Select described specific nonionic surfactant so that its hydrophilic head group can be interacted with lithium ion, and make it Hydrophobic tail can not adversely be interacted with the hydrophobic tail of this fatty acid and (will not spatially hinder vaporization prevention layer Formation).This specific nonionic surfactant does not also include any ethyleneoxy groups (i.e. polyoxyethylene group).This spy Determine nonionic surfactant seem to show with the lithium salts (lithium laurate, Oleic acid lithium etc.) of this vaporization prevention layer collaborative mutually Effect, which improves knot lid performance.
In embodiment disclosed herein it has been found that this specific nonionic surfactant to not only facilitate formation anti- Evaporation layer (and thus knot lid is removed in improvement), additionally aids ink and has desirable surface tension.
Previous vaporization prevention layer includes the lithium salts of such as fatty acid.Schematically show an example below：
Wherein R is fatty acid tail, and dotted line represents the ion between the carboxylic acid ion of this fatty acid and lithium ion Thermodynamic parameters.As described above, it has been found by the present inventors that some surfactants deleteriously affect this vaporization prevention layer (I) or The formation of similar vaporization prevention layer.Especially, the surfactant containing sulfonate radical head (such as sodium lauryl sulphate) and containing The surfactant having any ethyleneoxy groups may destroy this vaporization prevention layer formation (or at least deleteriously impact go tie Lid performance), and thus it is unsuitable for composition for ink disclosed herein.
Especially for the surfactant containing ethyleneoxy groups, 6 moles of ethyleneoxy groups can be coordinated 1 Mole lithium ion.In the example being shown below, ethoxylated surfactant (II) contains and is bound to six of Li ion Ethyleneoxy groups.In this example, R1Can be hydrophobic tail, it can contain additional ethyleneoxy groups, And R2Can be hydrogen atom or some other functional groups：
Such surfactant (II) may destroy vaporization prevention layer (I) as shown in schematic below：
In (III), the ethyleneoxy groups of surfactant (II) are by with hydrophobic tail-group R1End up is black Line represents.As shown, this surfactant reaches air-ink interface, and its ethyleneoxy groups preferentially combines Lithium ion, and thus prevent from forming this vaporization prevention layer.
Be different from the surfactant containing ethyleneoxy groups or sulfonate radical head, disclosed herein specific non-from Sub- surfactant includes the hydrophilic head group that can interact with lithium ion, and also includes spatially hindering anti- The hydrophobic tail of the formation of evaporation layer.Ethyleneoxy groups excluded by these nonionic surfactants any.
Interaction between the hydrophilic head group of nonionic surfactant disclosed herein and lithium ion is similar In hydrogen bonded effect.The example that the suitable hydrophilic head group of this interaction can be carried out includes hydroxyl (OH) group Or ketopyrrolidine.
This hydrophobic tail will not spatially hinder the formation of vaporization prevention layer.In other words, this hydrophobic tail i) tool Have suitable chain length, it will not prevent nonionic surfactant from incorporating vaporization prevention layer together with fatty acid, and/or ii) contain Suitable group, it will not prevent nonionic surfactant from incorporating vaporization prevention layer together with fatty acid.Non-ionic surface active Some examples of agent hydrophobic tail include ester group, C11To C13Saturated alkyl chain or C18Single at most unsaturated alkyl chain.Should The chain length of the hydrophobic tail of nonionic surfactant is at least partially dependent on this hydrophilic head group.In an example In, when this nonionic surfactant includes single hydroxyl head group, the hydrophobic tail of this nonionic surfactant Chain length may look like the chain length of the hydrophobic parts of this fatty acid.As instantiation, when the selection dodecylic acid (front-month Cinnamic acid) as fatty acid when, DODECANOL, 1- (i.e. lauryl alcohol) can be selected as this nonionic surfactant, suitable when selecting When formula-Octadec-9-enoic Acid (i.e. Oleic acid) is as fatty acid, Linolenic Acid-alkene -1- alcohol (i.e. oleyl alcohol) can be selected non-as this Ionic surface active agent.In another example, when this nonionic surfactant includes dihydroxy head group, this nonionic table The chain length of the hydrophobic tail of face activating agent can be shorter than the chain length of the hydrophobic parts of this fatty acid.As concrete reality Example, the tartrate of the alcohol of acetylenediol or more short length can be matched with dodecylic acid or octadecenoic acid.
Some particular instances that can be used for the nonionic surfactant of composition for ink disclosed herein include acetylene Glycol, double tartrate, 1,2- hexanediol, single methanol, N- alkyl pyrrolidone and combinations thereof.One example of acetylenediol is can Available from Air Products and Chemicals, Inc., Allentown, PA's104.Suitably The example of double tartrates includes tartaric acid diisoamyl ester, dibutyl tartrate, dibenzyl tartrate and tartaric acid diisopropyl ester. Some examples of suitable single methanol include lauryl alcohol (i.e. DODECANOL, 1-), oleyl alcohol (i.e. Linolenic Acid-alkene -1- alcohol), stearyl alcohol (i.e. 1- octadecanol) and combinations thereof.The example of N- alkyl pyrrolidone is NOP and N- dodecyl pyrrolidine Ketone.Some commercially available N- alkyl pyrrolidones includeLP-100 (octylpyrrolidone) andLP-300 (dodecyl pyrrolidone), both of which available from Ashland Inc., Covington, KY.
In one example of composition for ink disclosed herein, this nonionic surfactant is with this composition for ink About 0.01 weight % of gross weight exists to the amount of about 0.3 weight %.In another example, in this composition for ink non-from The amount of sub- surfactant is of about 0.05 weight % to about 0.3 weight %.When comprising multiple nonionic surfactant, It is understood that the total amount of all nonionic surfactants is in given range.
As described above, the example of this surfactant system is also made up of lithium and sour (such as fatty acid surfactant), Described acid is selected from Oleic acid (cis-double bondss), linoleic acid (two cis-double bondss), hendecanoic acid, dodecylic acid, tridecanoic acid And combinations thereof.
This fatty acid surfactant has carboxylate radical head and long alkyl afterbody (for example comprises having of carboxylate radical head The satisfied fatty acid of 11 to 13 carbon atoms, or there is the unsaturated fatty acid of the chain length of 18 carbon atoms).This carboxylic acid foundation Group contributes to forming vaporization prevention layer, thus seems to contribute to good to remove knot lid.Additionally, this alkyl afterbody has one or two Cis-double bondss.It has been found that having the fully saturated fatty acid of 14 or more carbon accordingly, or there is trans double bond that A bit, enhancing generally can not be provided to go to tie the same benefits of lid performance.Therefore, the example of the composition for ink of the disclosure eliminates choosing From following acid：Stearic acid (there is the fully saturated fatty acid of 18 carbon), elaidic acid (transisomer of Oleic acid), linolenic acid (three cis-double bondss), there is straight chain (contrary with the side chain) satisfied fatty acid of carbochain less than 11 carbon and have more than 13 Linear saturated fatty acids of carbochain of individual carbon and combinations thereof.
In an example, selected acid is dodecylic acid (also referred to as lauric acid).
This acid is existed with the amount of about 0.03 weight % of gross weight % of this composition for ink to about 1.0 weight %. In another example, the amount of the acid being present in this composition for ink is of about 0.1 weight % to about 1.0 weight %.
It should be understood that this lithium can be present in compositionss as the ion in solution or as this sour lithium salts.As reality Lithium can be added in this composition for ink, such as lithium chloride, lithium bromide, lithium iodide, hydroxide in the form of its multiple salt by example Lithium, Quilonorm (SKB), lithium benzoate, lithium nitrate or a combination thereof.But, lithium carbonate is typically unacceptable；Because in some cases It seems to reduce knot lid performance.
Additionally, other alkali metal, such as sodium and/or potassium, it is understood that there may be in the example of this composition for ink.But, It is understood by lithium to contribute to forming vaporization prevention layer；And that may be present other alkali metal both be helpless to formed vaporization prevention layer, also not Hinder and form vaporization prevention layer.
In an example, this composition for ink comprises about 50ppm to the lithium of about 400ppm.
Be illustrated below is using preventing that surfactant system disclosed herein is likely to form in composition for ink Several examples of evaporation layer.First exemplary vaporization prevention layer (IV) uses lithium, acid and the glycol (example as nonionic surfactant As104 or tartaric diester) formed, wherein R is the hydrophobic tail of selected acid, and R1And R2 It is the hydrophobic tail of selected glycol：
Second exemplary vaporization prevention layer (V) uses lithium, acid and the N- alkyl pyrrolidone shape as nonionic surfactant Become, wherein R is the hydrophobic tail of selected acid：
3rd exemplary vaporization prevention layer (VI) use lithium, acid and as nonionic surfactant single methanol (such as lauryl alcohol, Oleyl alcohol and/or stearyl alcohol) formed, wherein R is the hydrophobic tail of selected acid, and R1It is the hydrophobic tail of selected single methanol：
It is understood that this surfactant system can be by lithium, one or more examples of this acid and this nonionic One or more example compositions of surfactant.As example, in addition to lithium, this surfactant system may be by dodecane Acid and acetylenediol are (for example104)；Or dodecylic acid and N- alkyl pyrrolidone are (for exampleLP-100 orLP-300)；Or dodecylic acid and Oleic acid and acetylenediol With N- alkyl pyrrolidone composition.It is to be further understood that this surfactant system can be by a reality of lithium, this acid The group of two or more examples of example and this nonionic surfactant is combined into.As example, in addition to lithium, this surface Surfactant system can be by dodecylic acid, acetylenediol and single methanol；Or dodecylic acid, acetylenediol and double tartrate；Or ten Two alkanoic acids, acetylenediol and N- alkyl pyrrolidone；Or dodecylic acid, acetylenediol, N- alkyl pyrrolidone and single methanol composition.
As described above, this surfactant system not only facilitates the formation of vaporization prevention layer, additionally provide suitable moistening Characteristic.It is believed that this surfactant system mates or beyond acceptable surfactant in terms of reducing surface tension Energy (for example compared with the surfactant comprising ethyleneoxy groups).
In addition to surfactant system, the example of composition for ink disclosed herein includes coloring agent, cosolvent Water with surplus.Other additives such as Biocide or polymeric binder can also be added in this composition for ink.
This coloring agent can be any one of self-dispersed pigment, polymer dispersion pigment, dyestuff and combinations thereof.
White carbon black can be used as coloring agent in the example of this composition for ink.It is, for example possible to use as lampblack, furnace black or The white carbon black of channel black type.These white carbon blacks can be made water scattered：By oxidation, manufacture by carbon black process or by white carbon black Post processing (for example passes through ozonisation)；By the small molecule of carbon blacksurface and water solublity or dispersibility, oligomer or polymer Material (such as para-amino benzoic acid, by monomer such as acrylic or methacrylic acid and its acrylic oligomer made of ester or Polymer, and/or urethane oligomer or polymer) reaction.These white carbon blacks also can pass through above-mentioned acrylic acid, methyl The absorption of the oligomer of acrylic acid or urethane composition or polymer and be formed in scattered in water.White carbon black can pass through use-case As the latex polymerization being made up of acrylic acid, acrylate, methacrylic acid, methacrylate, styrene or vinyl acetate Thing coated pigment and make scattered further.These materials can by comprise in the polymer various functional groups (as carboxylate radical, Sulfonate radical, phosphate radical or epoxyethane derivative) and make scattered.
Some suitable self-dispersing white carbon blacks, and polymer dispersion pigment be purchased from E.I.du Pont de Nemours And Co. (Wilmington, Delaware), Sensient Technologies Corporation (Milwaukee, ) and Cabot Corporation (Boston, Massachusetts) Wisconsin.
Can use color or chemical composition are not had conditional other pigment, some of example include PY74, PY155, PY128、PY185、PR122、PR254、PR178、PV19、PB15：2、PB15：3 and PB15：4.These coloring agent can also pass through Various means, such as small molecule, oligomer or polymer attachment, by the absorption of oligomer or polymeric material, or by cladding (such as to described in white carbon black like that) and be formed in scattered in water.
Any suitable dyestuff can be used for the example of this composition for ink.
In example disclosed herein, this coloring agent can with about 2 weight % of composition for ink gross weight % extremely The amount of about 7 weight % exists.In another example, this coloring agent can be with about 4 weights of composition for ink gross weight % The amount of amount % to about 4.5 weight % exists.It is understood that this coloring agent, together with polymeric binder, can be to assign This composition for ink is given to be comprised with the amount of high solids content (i.e. total amount together with binding agent for the coloring agent).In an example, Select colorant load amount and polymeric binder load capacity so that total (high) solid content of this composition for ink is this ink About 4.5 weight % of composition total weight percentage ratio are to about 9.0 weight %.The example of this polymer bonding dosage is described in Hereinafter.
This cosolvent can be 2-Pyrrolidone；Sulfolane；Diethylene glycol dimethyl ether；1- (2- ethoxy) -2-Pyrrolidone (HE2P)；Diethylene glycol；Triethylene glycol；TEG；Tripropylene glycol；1- (2- ethoxy) -2- imidazolone；Two-(2- hydroxyl second Base) -5,5- dimethyl hydantoin (asDHE is purchased from Lonza, Inc., Allendale, NJ)；Three Ethylene glycol monoethyl ether；Tetraethyleneglycol dimethyl ether；Glycerol polyoxyethyl ether；2- methyl isophthalic acid, ammediol；2- ethyl -2- (hydroxyl first Base) -1,3-PD (EHPD) (also referred to as trimethylolpropane)；Glycerol；Dipropylene glycol；3- methyl isophthalic acid, 3- butanediol；3- first Base -1,5-PD；1,6- hexanediol；1,5-PD；And combinations thereof.A kind of instantiation bag of the appropriate combination of cosolvent Include 2- ethoxy -2-Pyrrolidone and 2-Pyrrolidone.Another instantiation of the appropriate combination of cosolvent include 2- ethoxy- 2-Pyrrolidone, 2-Pyrrolidone and sulfolane.
The total amount of the cosolvent being present in composition for ink is of about 10 weight % to about 30 weight %.No matter comprise Single cosolvent or the combination of two or more cosolvents, cosolvent total amount is in the range of providing.
The example of the composition for ink of the disclosure may further include selected from Biocide, polymeric binder and its group The additive closing.
When using Biocide, the suitable amount of this Biocide can be about 0.05 weight % to about 0.5 weight Amount %.It is understood that the upper limit of Biocide is likely to be dependent on type and its toxicological effect and/or the method for this Biocide Rule require.Suitable Biocide includes such as PROXELTMGXL、KORDEKTMMLX(The Dow Chemical Co.)、 BIOBANTMCS-1246 (The Dow Chemical Co.) and/orB20 and/or M20 (Thor GmbH).
This polymeric binder can be polyurethane copolymer binding agent or acrylate type polymeric binder.Work as bag When including, in composition for ink, the amount of polymeric binder can be about 1 weight % of composition for ink gross weight % to about 3 Weight %.In another example, the amount of polymeric binder is of about 1.7 weight % to about 2.0 weight %.As described above, Select colorant load amount and polymeric binder load capacity so that total (high) solid content of this composition for ink is this ink About 4.5 weight % of composition total weight percentage ratio are to about 9.0 weight %.When using high solids content, gained printing figure As desirable optical density (OD) and desirable durability can be shown.
In an example, the binding agent for composition for ink disclosed herein is by diisocyanate and at least three Plant the polyurethane copolymer binding agent that the polymerization of glycol is formed.In an example, this at least three kinds glycol are included containing hydrophilic First glycol of property stable group, have less than 8 atoms in the main chain between two oh groups one or more Two glycol (this results in short hard segment (being shown in lower formula (X))).In another example, this at least three kinds glycol include First glycol, the second glycol and the 3rd glycol with formula OH-R-OH, wherein R is selected from polyethers, polyester, Merlon, poly- carbonic acid Ester -co- polyester and acrylic acid.In another example, this at least three kinds glycol include the first glycol, the second glycol and have formula OH-R43rd glycol of-OH, wherein " R4" be defined in lower Formula X.As example, R4Can be C1-C7Alkyl or C6-C40Aryl, Or by C1-C10The C that alkyl replaces9-C40Aryl.The example of each glycol is provided below.
In example disclosed herein, this polyurethane copolymer binding agent is formed by the reaction of isocyanates and glycol, And thus include hard and soft segment.Hard segment be between two adjacent carbamate groups and include two adjacent The segment of carbamate groups.Soft chain segment is formed by high molecular weight diol or polyhydric alcohol.Soft chain segment is moveable, and can To be existed with coiling form.Same or like on the carbamate groups on a polymer chain with adjacent polymer chains Group forms hydrogen bond, obtains polyurethane network.In many cases, in polymer network, soft continuous phase surrounds hard half Crystal region.
In polyurethane, hard segment is covalently coupled on soft chain segment.Adjust firmly and soft chain segment can be to this polyurethane copolymerization Thing provides elasticity and the toughness of desired level.In many polyurethane, ionogen is incorporated to hard segment so that this poly- ammonia Ester water dispersibles.But, in hydrogen bond, and example thus disclosed herein between ionogen meeting disturbing molecule, in institute Ionogen (for example, see lower formula (X)) is not included at least short hard segment obtaining polyurethane copolymer.This enhance poly- Urethane copolymer.Separate ionogen and can also better control over acid content from short hard segment, reduce semi-crystalline region simultaneously The time that domain is formed, which in turn reduces drying time.
In example disclosed herein, isocyanates are more than 1: 1 to the ratio of glycol.In an example, isocyanates Ratio to glycol is of about 1.05: 1 to about 1.5: 1.
In an example, polyurethane copolymer binding agent has following structure：
Wherein Q1、Q2And Q3It is each independently selected from
As long as Q1、Q2And Q3Containing at least one (VIII), at least one (IX) and at least one (X).(VIII), (IX), and/or in (X), the following is applicable：
Each R1It is the C from diisocyanate1-C20Alkyl, C3-C20Replace alkyl, C3-C10Cycloalkyl, C3-C20Replace Cycloalkyl or C6-C40Aryl or C9-C40Substituted aryl；
Each R2It independently is C3-C20Replace alkyl, C3-C20Substituted cycloalkyl or C9-C40Substituted aryl；
Each R3It independently is C9-C20Alkyl, by C1-C10Alkyl or C6-C15The C that aryl replaces9-C20Alkyl, C9-C40Virtue Base or by C1-C10Alkyl or C6-C20The C that aryl replaces9-C40Aryl or-(R11-O-R10-O-R11)-；Or HO-R3- OH is simultaneously Enter polyethers, polyester, Merlon, Merlon -co- polyester or acrylic acid glycol；
Each R4It independently is C1-C7Alkyl, by C1-C10Alkyl or C6-C15The C that aryl replaces3-C20Alkyl, C6-C40Virtue Base or by C1-C10Alkyl or C6-C20The C that aryl replaces9-C40Aryl, condition is to be formed to connect two oxygen atoms in (IV) The R of chain4On skeletal atom be less than 8；
N, m and p are 1 to 200 integers；
This end-capping reagent is selected from R5CHR6OH、R5CHR6SH、R6R7NH、H-(OR8)q- OH and epoxide CH2OCR6R7's One or more；
Each R5It is H, C1-C20Alkyl, by C1-C10Alkyl or C6-C15The C that aryl replaces3-C20Alkyl, C6-C40Aryl or By C1-C10Alkyl or C6-C20The C that aryl replaces9-C40Aryl；
Each R6It is H, C1-C20Alkyl, C6-C40Aryl or-R9OR8；
Each R7It is H ,-R9OR8、C1-C20Alkyl, by C1-C10Alkyl or C6-C15The C that aryl replaces3-C20Alkyl, C6-C40 Aryl or by C1-C10Alkyl or C6-C20The C that aryl replaces9-C40Aryl, condition is to work as R6During for H, R7It is not H；
·R6And R7Cyclammonium or substituted cyclammonium can be formed together with nitrogen-atoms, O or S atom replace the C on described cyclammonium Atom；
Each R8It is C1-C20Alkyl or C6-C20Aryl；
Each R9It is C1-C20Alkyl, by C1-C10Alkyl or C6-C15The C that aryl replaces3-C20Alkyl；
Each R10It independently is C4-C20Alkyl, by C1-C10Alkyl or C6-C15The C that aryl replaces4-C20Alkyl, C9-C40Virtue Base or by C1-C10Alkyl or C6-C20The C that aryl replaces9-C40Aryl；
Each R11It independently is C1-C20Alkyl, by C1-C10Alkyl or C6-C15The C that aryl replaces4-C20Alkyl；With
Q is 1 to 20 integer.
In example disclosed herein, this isocyanates is diisocyanate.Suitable diisocyanate can be selected from 1,6- hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), trimethyl hexamethylene diisocyanate (TMDI), 2,4 toluene diisocyanate (2,4-TDI), 2,6- toluene di-isocyanate(TDI) (2,6-TDI), 4,4 '-diphenylmethyl Alkane diisocyanate (MDI), 4,4-- dicyclohexyl methyl hydride diisocyanate (H12MDI), 3,3 '-dimethyl -4,4 '-biphenyl two Isocyanates (TODI), dodecane diisocyanate (C12DI), 1,5- naphthalene diisocyanate (NDI), a tetramethylene benzene diformazan Group diisocyanate (TMXDI), Isosorbide-5-Nitrae-phenylene diisocyanate, trans-cyclohexane-Isosorbide-5-Nitrae-diisocyanate and 4,6- xyxylene Diisocyanate.
Comprise hydrophilic stable group and ultimately form some realities of the first glycol of a part for monomer for formula (VIII) Example include dihydroxymethyl acetic acid, 2,2 '-dimethylolpropionic acid (butanoic acid), 2,2 '-dihydromethyl propionic acid (DMPA) and 2,2 '-dimethylolpropionic acid (butyric acid).
There is in the main chain between two oh groups less than 8 atoms and ultimately form one of monomer of formula (X) Point the second glycol some examples include 1,2-PD, 1,3-PD, ethylene glycol, BDO, 1,5-PD, 1,6- hexanediol, 1,2- hexanediol, neopentyl glycol, 2- methyl isophthalic acid, ammediol, 3- methyl isophthalic acid, 5- pentanediol and combinations thereof.
When included, the example of the 3rd glycol has hydrophobic chain segment and ultimately forms a part for the monomer of formula (IX). Some examples of 3rd glycol have formula OH-R-OH, and wherein R gathers selected from polyethers, polyester, Merlon, Merlon -co- Ester and acrylic acid.Other examples of the 3rd glycol have formula OH-R4-OH.R4Can be any example being above given, such as C1-C7 Alkyl or C6-C40Aryl or by C1-C10The C that alkyl replaces9-C40Aryl.
Any suitable method that at least three kinds glycol of isocyanates and this react is made to can be used for forming this polyurethane copolymerization Thing.When expectation terminates polymerization, above-mentioned end-capping reagent can be added.The amount of the end-capping reagent using should be substantially equal to prepolymer In unreacted isocyanate groups.By working as gauge, in chain terminating agent, the reactive hydrogen of amine groups is to Carbimide. in prepolymer The ratio of ester group is of about 1.0: 1 to about 1.2: 1 or about 1.0: 1.1 to about 1.1: 1 or about 1.0: 1.05 to big About 1.1: 1.
In final polyurethane copolymer binding agent, the molar percentage of the second glycol is polyurethane copolymer binding agent At least the 30% of middle diol monomer total moles percentage ratio.The acid number of this polyurethane copolymer binding agent is 50 to 70, and this is poly- The number of urethane copolymer binding agent all (Mn) molecular weight is of about 3,500 to about 10,000.In another example, this polyurethane The M of copolymer bindernIt is of about 5,000 to about 8,500.
As described above, this polymeric binder can be acrylate type polymer.Suitable acrylate polymer Can by having the molecular weight of about 2000 to about 200,000, the polymer of the acid number of about 30 to about 180 forms.Close Some examples of suitable monomer include the ester of acrylic acid, methacrylic acid and acrylic acid and methacrylic acid.
It is to be understood that permissible when using acrylate type polymeric binder or polyurethane copolymer binding agent Select cosolvent desirably binding agent to be dispersed in whole composition for ink.
In any example disclosed herein, the surplus (reaching 100 weight %) of said composition is water.
The pH of the example of this composition for ink is typically about 7 to about 11.Desirably this composition for ink has alkali Property pH, is any value more than 7 to 12.When the initial pH of gained composition for ink is acid, neutral or close to neutral alkalescence It is also desirable to by the pH regulator of gained composition for ink to alkaline or more alkaline pH when (for example, there is 7.1 to 8 pH value). Any suitable alkali can be added to adjust pH, as long as the alkali adding does not disturb other desirable properties of this composition for ink.Properly Some examples of alkali include NaOH or KOH.Add alkali amount be at least partially dependent on this composition for ink initial pH and The required final pH of this composition for ink.In an example, by pH regulator to about 9 to about 10, and add appropriate Alkali is until obtaining this pH.
Furthermore, it is to be understood that composition for ink disclosed herein is particularly suitable for thering is about 2kHz to about 36kHz Drop frequency (drop frequency) any ink-jet printing system.In an example of high speed printing, this drippage frequency Rate can be about 24kHz to about 36kHz.This ink-jet printing system can be heat or piezoelectricity.
Referring now to Fig. 1, print cartridge is generally with 10 descriptions.Print cartridge 10 includes shell 12, and (it can include one or many The layer of individual different materials), shell 12 is operatively connectable to storage room 14, and storage room 14 contains combination of inks disclosed herein The example of thing 20.Fluid path/ink channel 24 connects storage room 14 to fluid ejector 16.In thermal inkjet-printing box, Fluid ejector 16 is to produce heat to evaporate the heating element heater of composition for ink 20, and it produces bubble, and this air bubble expansion is by ink Water composition 20 (in the form of drop 22) is released from the aperture 26 of the nozzle 18 being alignd with fluid ejector 16.Although display Single fluid ejector 16 and nozzle 18 it is to be understood that single print cartridge 10 may include multiple (for example, 400 or some Other desirable quantity) fluid ejector 16 and nozzle 18.Although not showing it is to be understood that print cartridge 10 includes integrated electricity Road, signal (for example, from the processor that can run suitable computer-readable instruction) is sent by this integrated circuit by route To required fluid ejector 16 and nozzle 18, so that therefrom transmitting ink droplets 22 are to produce image on required medium.
This print cartridge 10 represents single-nozzle, and it is to be understood that single print cartridge includes many nozzles.When being included in Including when in the high-speed inkjet printing system of page-wide array it is to be understood that multiple print cartridge 10 (mould) is placed together, Its each self-contained at least 1,000 nozzle.Although not showing it is to be understood that high-speed inkjet printing system may also contain certainly Dynamicization service station.This service station can be programmed to ensure that print cartridge 10 automatically added a cover with minimum system downtime, go knot lid and Cleaning.This also contributes to improve print quality.
As described above, the example of the surfactant system in composition for ink 20 is during going knot lid untapped, Form vaporization prevention layer at the interface I between air and composition for ink 20 in the aperture 26 of nozzle 18, thereby reduce water Evaporation from composition for ink 20.
Referring now to Fig. 2, according to the disclosure improve composition for ink 20 go to tie the example of the method for lid performance generally with 200 descriptions.The method 200 includes selecting surfactant system, as shown in reference 202.This surface activity Agent system is by sour (selected from Oleic acid, linoleic acid, hendecanoic acid, dodecylic acid, tridecanoic acid and combinations thereof)；Lithium；With nonionic table (it is included the hydrophilic head group being interacted with lithium and will not spatially hinder by this surfactant system face activating agent Form the hydrophobic tail of vaporization prevention layer) formed.As it was previously stated, any ethylidene oxygen excluded by selected nonionic surfactant Base group.As shown in reference 204, the method 200 further includes to be incorporated to selected surfactant system Mixture, described mixture includes coloring agent；Cosolvent；And water.
In order to further describe the disclosure, herein give embodiment.It is understood that providing these embodiments to be Descriptive purpose, rather than be construed to limit the scope of the disclosure.
Embodiment
Preparation includes 24 kinds of embodiment ink (ink 1- of the example of surfactant system disclosed herein 20th, 22,23,28 and 29).Also it is prepared for five kinds of contrasts ink (ink 21 and 24-27).Also it is prepared for one kind and do not contain surface work The contrast ink (ink 30) of property agent system.
In each embodiment ink and comparative example ink, this coloring agent is self-dispersing carbon black dispersion liquid (C K), cosolvent It is 1- (2- ethoxy) -2-Pyrrolidone (HE2P) and 2-Pyrrolidone (2P), polymeric binder is polyurethane (PU) dispersion Liquid (includes the example of the polyurethane copolymer binding agent in sulfolane).Contrast ink 21 and 24-27 in and ink 20, 22nd, the polyurethane copolymer binding agent in 23,28 and 29 is by isophorone diisocyanate (IPDI) and 1,3-PD, hydroquinone The reaction of double (2- ethoxy) ether (HQEE) and dihydromethyl propionic acid (DMPA) is formed.In contrast ink 30 and ink 1-19 Polyurethane copolymer binding agent is by isophorone diisocyanate (IPDI) and 1,3-PD, 1,2-PD and dihydroxymethyl The reaction of propanoic acid (DMPA) is formed.
In some embodiment inks (20,22,23,28 and 29) and some comparative example inks (21 and 24-27), self-dispersing Carbon black dispersion liquid and polyurethane dispersing liquid blending, and removed any molten before being added in this ink or contrast composition for ink Agent.Therefore, these inks and contrast ink do not comprise sulfolane.In other embodiments ink and contrast ink 30, by poly- ammonia Ester dispersion liquid is added in this composition for ink, and thus this final composition comprises sulfolane, and at least one part comes from this Polyurethane dispersing liquid (as shown in table 1).
Surfactant system in embodiment ink includes dodecylic acid (DA, as acid), lithium (Li) and carries herein For one kind of nonionic surfactant or combination.Surfactant system in each contrast ink includes dodecylic acid, lithium With at least one surfactant comprising ethyleneoxy groups.
The formula of this ink and contrast ink shows in Table 1.It is labeled as in the hurdle of " surfactant system " also in table 1 Specifically list nonionic surfactant and amount used in ink and contrast ink, which provide each non-ionic surface and live Property agent (NI Surf) title and the percentage by weight of nonionic surfactant.Balance of water.Each ink and contrast ink PH is 8 to 11.
Table 1
* comprise the surfactant of ethyleneoxy groups
Measure the surface tension of each embodiment ink and contrast ink.Result shows in table 2.This surface tension uses Wilhelmy plate method records on Kruss surface tensiometer K11.
Assessment embodiment ink goes knot lid performance with contrast ink.Used in the present embodiment, print system is on the page Injection ink droplet (to keep printing health) (" being injected on the page " (SoP)).By ink with contrast fill ink to HP 940 ink In box, using HP OfficeJet Pro 8000 series printer printing nozzle check pattern.Before will starting test, right Nozzle carries out pretreatment (primed), and implements nozzle check pattern and all can acceptably be launched with guaranteeing all nozzles.Across In each scanning process of the page, the pattern that pen prints 151 vertical lines at a distance of about 1/16th inch (includes initial 0 second line of reference).Form vertical line by launching all nozzles of a drop.Therefore, each line is a drop width, about 7/8 Inch is high, corresponding to the length of the nozzle array on printhead.First vertical line of each scanning be after without waiting for the time from In each nozzle, the first dropping liquid of transmitting drips, and Article 2 line prints after going to tie 4 seconds lid time, and Article 3 line is going to tie the lid time Print after 4 seconds again, thus to all 151 lines." bad " goes knot lid to represent that most of nozzles are lost or cannot be launched；And " good " goes Knot lid represents that nozzle is correctly launched to all 151 lines.
Table 2
Ink Surface tension (Dynes/cm) Remove knot lid
Ink 1 36.8 Good
Ink 2 37.3 Good
Ink 3 35.7 Good
Ink 4 23.1 Good
Ink 5 29.3 Good
Ink 6 36.8 Good
Ink 7 36.6 Good
Ink 8 39.8 Good
Ink 9 37.1 Good
Ink 10 23.8 Good
Ink 11 26.1 Good
Ink 12 34.3 Good
Ink 13 32.6 Good
Ink 14 23.5 Good
Ink 15 29.8 Good
Ink 16 30.2 Good
Ink 17 29.9 Good
Ink 18 34.1 Good
Ink 19 29.4 Good
Ink 20 30.1 Good
Contrast ink 21 30.6 Bad
Ink 22 33.6 Good
Ink 23 29.4 Good
Contrast ink 24 30.2 Bad
Contrast ink 25 31.8 Bad
Contrast ink 26 36.3 Bad
Contrast ink 27 39.3 Bad
Ink 28 32.2 Good
Ink 29 31.2 Good
Ink 30 44.2 Good
In Fig. 2, the surface tension result of display shows, comprises exemplary surfactants system disclosed herein and (does not contain Have any ethyleneoxy groups) ink surface tension can with comprise the surfactant with ethyleneoxy groups Contrast surfactant system compare, even lower in some cases.Contrast ink without any surfactant system The surface tension highest of water 30.
In Fig. 2, the knot lid result of going of display shows, when comprising the surfactant of ethyleneoxy groups, goes to tie Lid performance is adversely affected.On the contrary, including surfactant system disclosed herein, (it does not include ethyleneoxy group base Group) the various embodiment inks of different instances show and good go to tie lid performance.
Although contrast ink 30 (without surfactant system) shows the good knot that goes and covers, this surface tension is undesirable Ground is high.In addition it was further observed that contrast ink 30 (not containing surfactant system) also has inferior nozzle health, nozzle exists It is dirty after use.Therefore, do not contain surfactant system disclosed herein it has to go to tie Gai Yuqi in SoP Its print characteristic is as weighed between pen/nozzle moistening, drying time, print quality etc..
Mention " example ", " another example ", " example " etc. in the whole text in this specification to refer to and this embodiment Specific factor (such as feature, structure and/or characteristic) in conjunction with description is incorporated herein at least one embodiment of description In, and there may be or can be not present in other embodiments.Furthermore, it is to be understood that the institute for any embodiment State key element can combine in any suitable manner in embodiments, unless context is separately explicitly indicated.
It is understood that scope provided herein includes described scope and any value in described scope or subrange. For example, the scope of 50ppm to about 400ppm should be interpreted that the boundary of the 50ppm to about 400ppm not only including clearly enumerating Limit, and include an other value, such as 53ppm, 104.25ppm, 350ppm etc., and subrange such as about 150ppm is to about 375ppm, 125ppm are to about 300ppm etc..Additionally, when " about " or " substantially " is used for description value it means that containing The minor variations (highest +/- 10%) apart from setting are covered.
When disclosed herein example is described and claimed as, singulative " one ", " a kind of " and " being somebody's turn to do " are included again Number referring to thing, unless separately clearly stated.
Although multiple embodiments are described in detail it is to be understood that disclosed embodiment can be modified.Cause This, description above is considered as nonrestrictive.

Claims (15)

1. composition for ink, comprises：
Coloring agent；
Cosolvent；
Surfactant system, consists of：
Acid selected from Oleic acid, linoleic acid, hendecanoic acid, dodecylic acid, tridecanoic acid and combinations thereof；
Lithium；With
Formed by described surfactant system including the hydrophilic head group interacting with lithium and will not spatially hindering The nonionic surfactant of the hydrophobic tail of vaporization prevention layer, described nonionic surfactant does not conform to any ethyleneoxy group Group；With
Water.
2. composition for ink as defined in claim 1, wherein said nonionic surfactant is selected from acetylenediol, double Tartrate, 1,2- hexanediol, single methanol, N- alkyl pyrrolidone and combinations thereof.
3. composition for ink as defined in claim 2, wherein said pair of tartrate is selected from dibutyl tartrate, winestone Sour dibenzyl ester and tartaric acid diisopropyl ester.
4. composition for ink as defined in claim 2, wherein said single methanol be selected from lauryl alcohol, oleyl alcohol, stearyl alcohol and its Combination.
5. composition for ink as defined in claim 1, wherein said surfactant system is by lithium and following one kind Composition：
Dodecylic acid and acetylenediol；
Dodecylic acid, acetylenediol and the single methanol selected from lauryl alcohol, oleyl alcohol and stearyl alcohol；
Dodecylic acid, acetylenediol and the double winestones selected from dibutyl tartrate, dibenzyl tartrate and tartaric acid diisopropyl ester Acid esters；
Dodecylic acid, acetylenediol and N- alkyl pyrrolidone；
Dodecylic acid, acetylenediol, N- alkyl pyrrolidone and the single methanol selected from lauryl alcohol, oleyl alcohol and stearyl alcohol；Or
Dodecylic acid and N- alkyl pyrrolidone.
6. composition for ink as defined in claim 1, in addition to lithium, exclusion forms the alkali metal of described vaporization prevention layer Salt.
7. composition for ink as defined in claim 1, the pH of wherein said composition for ink is of about 7 to about 11.
8. composition for ink as defined in claim 1, wherein said coloring agent is selected from self-dispersed pigment, polymer dispersion Pigment, dyestuff and combinations thereof.
9. composition for ink as defined in claim 1, wherein said cosolvent includes 2-Pyrrolidone；Sulfolane；Two Glyme；1- (2- ethoxy) -2-Pyrrolidone；Diethylene glycol；Triethylene glycol；Tripropylene glycol；TEG；1-(2- Ethoxy) -2- imidazolone；Two-(2- ethoxy) -5,5- dimethyl hydantoin；Triethylene glycol ethyl ether；TEG two Methyl ether；Glycerol polyoxyethyl ether；2- methyl isophthalic acid, ammediol；2- ethyl -2- (methylol) -1,3-PD；Glycerol dipropyl two Alcohol；3- methyl isophthalic acid, 3- butanediol；3- methyl isophthalic acid, 5- pentanediol；1,6- hexanediol；1,5-PD；And combinations thereof.
10. composition for ink as defined in claim 1, comprise further selected from Biocide, polyurethane adhesive, third The additive of olefine acid ester polymer binding agent and combinations thereof.
11. composition for ink as defined in claim 10, wherein said polyurethane adhesive be by diisocyanate and The polyurethane copolymer binding agent that the polymerization of at least three kinds of glycol is formed, described at least three kinds glycol include stable containing hydrophilic First glycol of group, there is in the main chain between two oh groups the second glycol less than 8 atoms, wherein said The molar percentage of two glycol is at least 30% of the total moles percentage ratio of diol monomer in described polyurethane copolymer binding agent, And the acid number of wherein said polyurethane copolymer is 50 to 70.
12. composition for ink as defined in claim 1, wherein：
Described coloring agent is existed with the amount of about 2 weight % to about 7 weight %；
Described cosolvent is existed with the amount of about 10 weight % to about 30 weight %；；
Described acid is existed with the amount of about 0.03 weight % to about 1.0 weight %；
Described nonionic surfactant is existed with the amount of about 0.01 weight % to about 0.3 weight %；
Described lithium is existed with the amount of about 50ppm to about 400ppm；With
The balance of water of described compositionss.
13. print cartridges, comprise：
Fluid reservoir；
The fluid ejector being in fluid communication with described fluid reservoir；
The nozzle being in fluid communication with described fluid ejector；
It is present in the composition for ink in described fluid reservoir, described composition for ink comprises：
Coloring agent；
Cosolvent；
Surfactant system, consists of：
Acid selected from Oleic acid, linoleic acid, hendecanoic acid, dodecylic acid, tridecanoic acid and combinations thereof；
Lithium；With
Formed by described surfactant system including the hydrophilic head group interacting with lithium and will not spatially hindering The nonionic surfactant of the hydrophobic tail of vaporization prevention layer, described nonionic surfactant does not conform to any ethyleneoxy group Group；With
Water；
Described vaporization prevention layer is present in the interface in the aperture of described nozzle between air and composition for ink, is removing knot lid not Form described vaporization prevention layer during use, thus reduce evaporation from described composition for ink for the water.
14. print cartridges as defined in claim 13, wherein said surfactant system is by lithium and following a kind of group Become：
Dodecylic acid and acetylenediol；
Dodecylic acid, acetylenediol and the single methanol selected from lauryl alcohol, oleyl alcohol and stearyl alcohol；
Dodecylic acid, acetylenediol and the double winestones selected from dibutyl tartrate, dibenzyl tartrate and tartaric acid diisopropyl ester Acid esters；
Dodecylic acid, acetylenediol and N- alkyl pyrrolidone；
Dodecylic acid, acetylenediol, N- alkyl pyrrolidone and the single methanol selected from lauryl alcohol, oleyl alcohol and stearyl alcohol；Or
Dodecylic acid and N- alkyl pyrrolidone.
15. methods going to tie lid improving composition for ink, methods described includes：
Select surfactant system, consist of：
Acid selected from Oleic acid, linoleic acid, hendecanoic acid, dodecylic acid, tridecanoic acid and combinations thereof；
Lithium；With
Formed by described surfactant system including the hydrophilic head group interacting with lithium and will not spatially hindering The nonionic surfactant of the hydrophobic tail of vaporization prevention layer, described nonionic surfactant does not conform to any ethyleneoxy group Group；With
Selected surfactant system is incorporated in mixture, described mixture includes：
Coloring agent；
Cosolvent；With
Water.
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